A non-local closure model for vertical mixing in the convective boundary layer

Pleim, Jonathan; Chang, Jenq Yang

doi:10.1016/0960-1686(92)90028-j

Cited by 248 publications

(162 citation statements)

References 18 publications

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“…Development of the cloud module will continue to play a critical role in improving these predictions. For example, the current subgrid convective cloud parameterization (included in CMAQv4.7) uses an adaptation of the Asymmetric Convective Model (ACM) (Pleim and Chang, 1992) to mix pollutants vertically in the cloud column. A drawback to this mixing algorithm is that the downdraft is not explicitly simulated.…”

Section: Discussionmentioning

confidence: 99%

Incremental testing of the Community Multiscale Air Quality (CMAQ) modeling system version 4.7

et al. 2010

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Abstract. This paper describes the scientific and structural updates to the latest release of the Community Multiscale Air Quality (CMAQ) modeling system version 4.7 (v4.7) and points the reader to additional resources for further details. The model updates were evaluated relative to observations and results from previous model versions in a series of simulations conducted to incrementally assess the effect of each change. The focus of this paper is on five major scientific upgrades: (a) updates to the heterogeneous N 2 O 5 parameterization, (b) improvement in the treatment of secondary organic aerosol (SOA), (c) inclusion of dynamic mass transfer for coarse-mode aerosol, (d) revisions to the cloud model, and (e) new options for the calculation of photolysis rates. Incremental test simulations over the eastern United States during January and August 2006 are evaluated to assess the model response to each scientific improvement, providing explanations of differences in results between v4.7 and previously released CMAQ model versions. Particulate sulfate predictions are improved across all monitoring networks during both seasons due to cloud module updates. Numerous updates to the SOA module improve the simulation of seasonal variability and decrease the bias in organic carbon predictions at urban sites in the winter. Bias in the total mass of fine particulate matter (PM 2.5 ) is dominated by overpredictions of unspeciated PM 2.5 (PM other ) in the winter and by underpredictions of carbon in the summer. The CMAQv4.7 model results show slightly worse performance for ozone predictions.Correspondence to: K. M. Foley (foley.kristen@epa.gov) However, changes to the meteorological inputs are found to have a much greater impact on ozone predictions compared to changes to the CMAQ modules described here. Model updates had little effect on existing biases in wet deposition predictions.

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Section: Discussionmentioning

confidence: 99%

Incremental testing of the Community Multiscale Air Quality (CMAQ) modeling system version 4.7

et al. 2010

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“…Consequently, for unstable conditions non-local closure techniques are required even for horizontally homogeneous turbulence over a flat surface and zero mean wind (Ebert et al, 1989;Pleim and Chang, 1992). Nevertheless, even most of state-of-the-art non-local mixing schemes have difficulties to represent the entrainment processes at the top of even the cloudless boundary layer (Ayotte et al, 1996;Siebesma and Holtslag, 1996;McFarlane, 1997, 1999;Mironov et al, 1999).…”

Section: Rationale Of Non-local and High-order Modellingmentioning

confidence: 99%

Columnar modelling of nucleation burst evolution in the convective boundary layer – first results from a feasibility study Part I: Modelling approach

Hellmuth

2006

Atmos. Chem. Phys.

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Abstract.A high-order modelling approach to interpret "continental-type" particle formation bursts in the anthropogenically influenced convective boundary layer (CBL) is proposed. The model considers third-order closure for planetary boundary layer turbulence, sulphur and ammonia chemistry as well as aerosol dynamics. In Paper I of four papers, previous observations of ultrafine particle evolution are reviewed, model equations are derived, the model setup for a conceptual study on binary and ternary homogeneous nucleation is defined and shortcomings of process parameterisation are discussed. In the subsequent Papers II, III and IV simulation results, obtained within the framework of a conceptual study on the CBL evolution and new particle formation (NPF), will be presented and compared with observational findings.

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“…Em destaque, dentro da RMPA, a cidade de Porto Alegre e, no Uruguai, a cidade de Rio Negro. dinâmica de nuvens e a reações químicas por elas ocasionadas, o algoritmo ACM (Pleim e Chang, 1992) foi utilizado. Os arquivos de saída do módulo CCTM contêm os resultados finais das simulações do CMAQ; ou seja, os resultados das concentrações calculadas sobre todo espaço tridimensional do domínio de simulação, para cada espécie química estudada, bem como as taxas de remoção troposférica (por deposição seca e úmida) destas espécies.…”

Section: Síntese E Dispersão De Ozôniounclassified

Avaliação do impacto da resolução espacial de modelos digitais de elevação sobre a estimativa de formação de ozônio superficial usando Models-3

Meira

Ducati

Teixeira

2009

Rev. bras. meteorol.

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Este trabalho estabelece uma comparação básica entre dois cenários distintos de simulação da formação de ozônio superficial sobre o Estado do Rio Grande do Sul. No primeiro cenário usa-se um modelo digital de elevação com resolução de 9 km com a interface de simulação "Models-3". No segundo cenário, um modelo com resolução de 3 km é usado. Em cada cenário, implementa-se um único domínio de simulação, com resoluções correspondentes as do respectivo modelo. Dados do Centro Nacional Estadunidense de Previsão Ambiental foram usados na simulação meteorológica, e dados do Instituto Brasileiro de Geografia e Estatística e do Departamento de Trânsito do Rio Grande do Sul foram usados na estimativa das emissões devidas à frota veicular da Região Metropolitana de Porto Alegre (única fonte emissora aqui considerada). Os resultados apresentaram diferenças marcantes entre um cenário e outro. As concentrações constantemente elevadas de ozônio observadas à resolução de 9 km, tiveram seus níveis reduzidos à metade a 3 km. Também os padrões de dispersão tiveram características bem distintas, espalhando-se amplamente sobre a parte sul do domínio de simulação no primeiro cenário e, no segundo, espalhando-se de forma mais limitada sobre a parte sudoeste, com um jato observado em direção noroeste. Elevados níveis de concentração de ozônio foram observados a cerca de 500 km das fontes emissoras.

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A non-local closure model for vertical mixing in the convective boundary layer

Cited by 248 publications

References 18 publications

Incremental testing of the Community Multiscale Air Quality (CMAQ) modeling system version 4.7

Incremental testing of the Community Multiscale Air Quality (CMAQ) modeling system version 4.7

Columnar modelling of nucleation burst evolution in the convective boundary layer – first results from a feasibility study Part I: Modelling approach

Avaliação do impacto da resolução espacial de modelos digitais de elevação sobre a estimativa de formação de ozônio superficial usando Models-3

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